裂隙岩体蠕变断裂损伤本构模型的开发与应用
Development and Application of Creep Fracture Damage Constitutive Model for Fractured Rock Mass
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摘要: 为了研究在长期应力作用下，因岩体内部裂隙的开裂和扩展，而造成岩体的损伤，将蠕变裂隙岩体视为损伤的连续介质，通过分析蠕变裂纹的扩展演化，将初始裂隙的损伤张量、裂纹起裂和扩展的损伤张量、蠕变裂纹扩展的损伤张量相累加，描述岩体的蠕变损伤演化过程。将累加后的损伤张量引入到本构模型中，利用C++编译，开发出可模拟蠕变裂纹扩展的自定义本构模型动态链接库（DLL）。以某矿8106工作面为工程背景，利用该模型对停采线煤柱进行模拟，分析在不同时间段的损伤区和应力演化规律。结果表明：新的本构模型可以用于分析蠕变条件下裂隙损伤演化过程的规律；在考虑蠕变裂纹扩展的情况下，8106工作面的90 m宽保护煤柱可以满足安全生产要求。Abstract: In order to study the damage of rock mass under long-term stress which caused by the cracking and propagation of internal cracks in rock mass, the creep crack growth evolution is analyzed by analyzing the creep crack growth and the damage tensor, the crack initiation and propagation of damage tensor and the creep damage evolution of rock mass. The accumulated damage tensor is introduced into the constitutive model, and the model of C++ is compiled to develop a model of the dynamic link library (DLL), which can simulate the creep crack growth. Based on the engineering background of 8106 working face in a coal mine, the model is used to simulate and analyze the damage zone and the stress evolution laws in different periods. The results show that the new constitutive model can be used to analyze the evolution laws of crack growth under creep condition. In the case of creep crack growth, the 90 m wide protective coal pillar can meet the safety requirements.
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